power Stroke Problems - top End Of Power Stroke - Photo 22

Here’s a look at the valve slap that occurred on the top end of the engine above. According to Loren Taylor of Diesel Tech the engine was turned up courtesy of a poor tune from a programmer and spent much of its life in the 4,000-rpm range—a bad combo for any engine. The owner said he started feeling a high rpm vibration several hundred miles before the rod made an early exit. The point here is that no diesel engine is indestructible, because even when the proper measures are taken to ensure longevity, bad tuning can ruin anything.